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POOptimum Update frequency for a client server based multiplayer game
 

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    <p>I am making a multiplayer game in c++ :</p> <p>The clients simply take commands from the users, calculate their player's new position and communicate it to the server. The server accepts such position updates from all clients and broadcasts the same about each to every. In such a scenario, what parameters should determine the time gap between consecutive updates ( i dont want too many updates, hence choking the n/w). I was thinking, the max ping among the clients should be one of the contributing parameters. </p> <p>Secondly, how do i determine this ping/latency of the clients ? Other threads on this forum suggest using "raw sockets" or using the system's ping command and collecting the output from a file .. do they mean using something like <code>system('ping "client ip add" &gt; file')</code> or forking and exec'ing a ping command.. </p>
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    1. COFirst of all your basic concept is flawed. Send the COMMANDS to the server, NOT the positions. Otherwise you'll end up with more cheaters than you can think of. Secondly, the update rate depends on the type of your game in case of my http://github.com/BonsaiDen/NodeGame-Shooter thing, 50-300ms is enough. The bigger the timespan between your updates the more interpolation you'll have to do.
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      1. USIvo Wetzel
    2. COIvo, u r right, there is a lot of scope for cheating clients if i send the positions, but i figured, that since i m using UDP to send these update packets, if "position" updates are lost in transit then the damage to the game wouldn't be as severe as if the 'commans' updates are lost, in which case ill also have to keep synchronizing regularly with each client their correct positions ... Are u also suggesting that the update frequency should not be a function of the network performance (for example if the network is heavily loaded / relatively free) ?
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    3. COI you base the frequency on player ping it'd be easy for some one to slow down the whole game just by increasing his ping. Have you done some testing? Is UDP a fundamental requirement? What about non position stuff? Like firing, casting, clicking UI. Do you want to use UDP for that too? You'll end up with a lot of client side logic and tons of crazy server side validation code this way.
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